cleaned up integration test flow

test/wdio.remote.config.js

@@ -11,15 +11,16 @@ exports.config = Object.assign({}, common.config, {
   baseUrl: process.env.TEST_SERVER || 'https://send.dev.mozaws.net',
   exclude: [
     // the /test endpoint only exists on localhost
-    path.join(__dirname, './ui/unit-tests.js')
+    path.join(__dirname, './integration/unit-tests.js'),
+    // we don't have access to the fs in this context
+    path.join(__dirname, './integration/download-tests.js')
   ],
   capabilities: [
     { browserName: 'firefox' },
     { browserName: 'chrome' },
     { browserName: 'MicrosoftEdge' },
     {
-      browserName: 'safari',
-      exclude: [path.join(__dirname, './ui/upload-tests.js')]
+      browserName: 'safari'
     }
   ],
   services: ['sauce'],